Inhibition effect of nano-silica synergistic corrosion inhibitor on 110SSsteel in ultra-high temperature organic acidic environment

Abstract

Compared to hydrochloric acid, organic acids can reduce the acid rock reaction rate in high-temperature reservoir acidification. Although corrosion inhibitors can reduce the corrosion of acid on the pipe string, the ultra-high temperature makes the effectiveness of corrosion inhibitors unsatisfactory. We found that the use of nano-silica can improve the effectiveness of corrosion inhibitors in organic acid systems. Some interesting findings are as follows. Firstly, the ultra-high temperature made the adsorption film of LD-H uneven or incomplete. Next, the high-temperature corrosion inhibition ability of corrosion inhibitors was enhanced by adding nano-silica to organic acids, with a corrosion inhibition rate of up to 99%. Furthermore, the addition of nano-silica made the adsorption membrane of LD-H more complete or uniform, which more effectively inhibited corrosion reactions. By enhancing the adsorption capacity of corrosion inhibitors and filling adsorption membranes, nano-silica enhanced the corrosion inhibition effect of LD-H in organic acid systems.